# Attenuation range of HMC273MS10G

Document created by analog-archivist on Feb 23, 2016
Version 1Show Document

### Q

attenuation range is 1-31 dB :  is it dBm or dbW(max input power 1W or 100W)?

What is the real attenuation range of the device ?

### A

The attenuation range is a parameter to specify the minimum and maximum
attenuation levels that digital attenuator can produce relative to its
insertion loss. Since minimum and maximum attenuation levels are the normalized
values with respect to insertion loss, the attenuation range is weighted in dB.

For example, HMC273MS10G is a 1 dB LSB 5-Bit Digital Attenuator which consists
of an array of attenuation bits binary weighted (LSB=1dB, 2LSB=2dB, 4LSB=4dB,
8LSB=8dB, 16LSB=16dB). HMC273MS10G offers an attenuation range from 1dB to 31dB
(with respect to its insertion loss) with 1dB steps.
-When all the attenuation bits are switched out of the RF signal path, the part
still has an attenuation which is called insertion loss due to lossy switching
elements in path.
-When only least significant bit (LSB) is switched in of the RF signal path,
the part has an attenuation of ideally 1dB with respect to its insertion loss
(absolute attenuation is insertion loss plus 1dB). LSB determines the minimum
attenuation and step size.-When all the attenuation bits are switched in of the
RF signal path, the part has an attenuation of ideally 31dB (1+2+4+8+16) with
respect to its insertion loss. Sum of all the attenuation bits determines the
maximum attenuation.

The attenuation range does not specify the absolute operating power range
(dynamic range) of the digital attenuator product in Watt or dBm. High end
input power level of the dynamic range is specified by compression and
third-order intercept points given in the electrical specifications table of
HMC273MS10G datasheet. With 5V supply, HMC273MS10G offers input P0.1dB
compression of 27dBm and input IP3 of 48dBm.

The attenuation range does not specify the absolute operating power range
(dynamic range) of the digital attenuator product in Watt or dBm. High end
input power level of the dynamic range is specified by compression and
third-order intercept points given in the electrical specifications table of
HMC273MS10G datasheet. With 5V supply, HMC273MS10G offers input P0.1dB
compression of 27dBm and input IP3 of 48dBm.

Absolute maximum input power given in the absolute maximum ratings table is the
damage level and should never be exceeded. With 5V supply, absolute maximum
input power of HMC273MS10G is 30dBm.